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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '384ffdf79d8ecff7b3d6847df07b03a7c312dd46eef92740cde7e61394894d16' 
  AND token = 'aJRVuY943UqcwcIvJDnfdU0JgwWFdUxkbRDVpckIPKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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