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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5d19a78efb20852f8f9a102a7598c2ba94243fb5632e297f07f38c50f60133' 
  AND token = 'ORrq8qhu81c0aOSHq6Q7tSpdZ0EYTmBWrYAw0NpgOj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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