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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3fc31a96ff43318ddfe67cf029a2d593d666cfa5612d6f16d719f144d26907' 
  AND token = 'aWIhxjM8/WH84ldByL3Y5No6FBjMtDIxpI31ph6OHgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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