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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cf0e2b1167754d7c99831b73201de14adb23d20d56a85a0975b858fa11b42b' 
  AND token = '9KBFrCumqgPeaSg6VkC+rQ7c1t49do8YJdvwVLpSbFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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