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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805f1b6072db4d6bd6ced4e333e9dc0bf2498a2ce3f4e433b695b2ffa3bfeba8' 
  AND token = '7I9Fw3e9q8bQWy+txeYZrpNLuWVlmtvoQ28tWe53H2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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