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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03cd1497c499ed93f3e448ceb3cac9c6a51e98a166a9012cc7d6c4d6f122abce' 
  AND token = '5JwUbINJBe1xrWjTN60SHzpksZ4bbfDnWUSAPtGOA9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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