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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e3b8f56b7fdd5f306e6fbe19307bcd57b4e34e0fb11f5048662b42042252ba' 
  AND token = 'lRrr5dbp48sbgJMl1FWTKN+EfqaEB+8pkLMUzO2OjGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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