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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc917bdee634a98139a1cf97616823a4a774e8b976fcec3c9ccfac1f510c98f9' 
  AND token = '2WiJcd/xW6coHvPZg2vo2ClTP4fsiQiYp2N25biHWlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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