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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e40a0cc90ed935ecc45d82d26beabc5bfc526b32832f42c46efb83d10b42c2' 
  AND token = '30oeoM82fwZRvFiHtqSiN9Drfxy8df99qs2CGhIogL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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