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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d2da1fbbf3cfabd5348b42e97f8a5a4879b0544c97e2c282d93a90239887f3' 
  AND token = 'kcEFLpyNaINYkoWrpRFgqASVTKQZCD4z3K86zEzDxPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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