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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f55e2e97723183770f3c1f378a7ed3853814cee4f318528860d72511dc30f6f5' 
  AND token = 'flQG/YE6Beek/tIpsK8PVGpVuA1LQucoV3NBu/rlMh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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