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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfaed53b1dcf2b547ad4c25e9968d9ab79b7ea7d18f6b1dadcd949bf21c520fe' 
  AND token = 'gBJM+wF+LbDP9nD+0CrLqsZQllbMrrS27gJbZHS9EJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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