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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018ae688a5c2f4c4d773549454dc47ae1077d36442fa62c395edce5314fe338e' 
  AND token = 'wgWCb5W8tNQ5TZcvrHyJbXmezoq9/mZok4CBmqpPD00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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