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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f1f7fe4cb9e92d80093965457fb45c137bc7b29e1d3277d0b46953cbc516e3' 
  AND token = 'WirSzY24Lhw7Ztluyu3kUOJcuX2w3wyaeSLWKdWcUas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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