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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f979de4713acbaf089e08a5d25e8bdca0b5203c132781337b9f29e0daba05024' 
  AND token = 'd5D6HRN28UzwtoGGQWJU83kDudeL/3YTP819zlZMIrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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