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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1a9f9714bf7d4dfbc8289f76862189f9b19a12772e2b3e997628c485495b1d' 
  AND token = 'tGGrpyZOHoqHCj7/snYbq5iWi8jbULdNJumkMDYUjT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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