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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e463299b6d2fcaff6b8a59eb08cb2d739553cb81988203c80cd2465410d326c5' 
  AND token = 'eazqtW0yih5ukK3QepZ6T0F1mrphn+uTARUSo1g/0AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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