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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dac4db423bb8455cdab78483dba3661aee0879ac74e38b68856468c16ed2fbd9' 
  AND token = '3jre9cmQOfG3aGYX4g53T8pSH1twNfy8U4+MsuJNkJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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