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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3418d7e10f0c6e37247c6ddf636fc70d8b839f1d5abc298d9c3f8262199fcf94' 
  AND token = '7MPakz3gSifbrOihitV4SX6z1k5x+diuwEha9aDGgEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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