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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba756c4ab9fedb244ef0305810ee92c4ab78e24f5247774a8071203159e8ca47' 
  AND token = 'JTqpE4w+98LRiMAwi9Do/oohYnns+Pk3J+lGSEEMT0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}