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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33d0b110542eba9b32e3c669a1bb1ba3104e1f7717d3417ddad98b8f9330f90c' 
  AND token = 'AHyJ1ej4+0H1AhVBn54zDjlESMnH+bT35V954+nwMQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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