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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5399290dd72bc2ea236949cf3246b05235f89925a1912b4370890ca7e80c4ab' 
  AND token = '4R7rMymrTft3pRUvCwKhDYCoPOG4hq6JQsrfxjRWm44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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