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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee8cb0b9857874e61abb79e98739eae42457a3f2958a76bba87e75eacc9850f' 
  AND token = '3oUrpqi48+aYCZNPOV5whTPuQhwUhZFypJ+cickGv2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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