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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4337d84991ecb83d01eff6ec9f87cdb3f707e08d657b3dd81baaff6bc99b95be' 
  AND token = '7elwWkYhLUrLRt2VeWEC2R6Dy4JeEIRX9GP6Gg1nv44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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