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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc0e08914ee928dcfdceb7571b96315f12adeee78b92331daeddf60d5277a87' 
  AND token = 'eChlOMVDpDzuKHeB42fhpEmX5vsK/YP5l2c4jFjTcT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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