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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1211f9328c988d1c49491afa954213ff1c42bf16bccd0c45357bc0811258a076' 
  AND token = '4jBYT05UtoFF1ul3M4L/fxU+GbEA8V56i/JMP0MDi40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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