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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ece5f493f0e2cca4ed960b8fd082d63abeed1c567357023b92a30a7ac2c54d6' 
  AND token = 'MK/PiHwD1fqBIhoXqOoMVT91dxLn1H7W99Vlm4j3oBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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