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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd8a1067d246dc590a7412cf93673583270d47bfc96b0d45d638f852902d232c' 
  AND token = '0Gw2N36RV6DvYksKMprx8Pe2RpLtX1StPdpMNFN0rTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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