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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c01569ff96e1108d47ea07f7786c68f0d0db216f3640bf8ff17a8aca6efa8a7' 
  AND token = 'YE68b0o9zaKNSJ/blT5vkTYNCrEnVT3khKNLY/Hwd3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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