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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44ae5e9d1df8b19d76c0e920356b7dba0d354653d941b6348445867fa717e0f9' 
  AND token = 'SGcPeyv7tO8joL19RcgteAUcJQAVGDq1l6HLw9PxxgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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