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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62630ca8ebd4b13863212163b54c32b7333ed44f93f3e99709f9e88637e8bd55' 
  AND token = '0dhdJoUgSqHXQKEXmFgiHkBNV9Ia8EBg34hiK5EfKDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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