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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c87e02caa2e176c26fa273d81da1c35f42c4a773973410d0c549a568eaad1c3' 
  AND token = 'nQnt0FlRD8II69GsgFVV31h0iLoyRRIRM/9cifyX4p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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