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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a710e76e01d5f96e2bbfdbbc39101d67a4b0b8212a268cef2ef303544dc200b' 
  AND token = '7c/oLjc9jdUN6fs3lXcvPxheiaqrkP/insQu8DHzHAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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