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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82b9b8438e727b64bc8394400e3599fa81e2a4ba0647148689ade2d27ab38fd' 
  AND token = 'E8n9K2osjlNVL5Ws3XHURnq8+xe9xsKrpk8ir1PQG/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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