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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa8d9a7423221d80aec0c4ef0ea0484fad22725f3f06bdf08551c6bca040295' 
  AND token = '2LWAWqgJmSBQFX4PQx+zdHZ8G1pJDJcp+flS0lrw6m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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