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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb59dfe8cbdd6e95d06b231c6af9705e1f7011f66e7c1af0269913234abe39c' 
  AND token = 'JbKqAkfHMR70fdcsbKiA8ae7XedOnaT/JdrfJ42M2LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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