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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75f213bd43702bb74a23f7e0c529e26214f3aa411c58e80a7b6366bb48382a7e' 
  AND token = '+jBYuNYUQmig+z8ajUDE3k4niln0fr/ce8ML2NW29Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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