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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85805a761b1460cad798ece8d7ebce522f7a71e00b6e2c1b8c5af35c48f6004e' 
  AND token = 'X45j+N5vhzlamZzkGn5Ex5VCdSEYcXgwzR11eeDt2u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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