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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc95ea1debddc03b0d7f82cfae459b0a7d40d38e268638f0cbe47d9e3a53076' 
  AND token = 'uhJPqQvXT22fW1bK128L8z6gE9k8j8wzTn+HxigNnFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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