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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98324f8486e8d7a7de5533432939b513d6df5830b01655024852cf4434b9b414' 
  AND token = 'RjWHR2g/3LO3kHzrP9weskqN9CB5W/DtoB9FEnITyj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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