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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2041ba1bd61d5f4728e539e14dfcedc49b66b0fb098e83fbeb9dffd4f3b80c9a' 
  AND token = 'aRlV7SP7CmHrBIiluv8ZdEsDT+vawcKiYrFvb6e716Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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