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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839d09a16878e123894ed6f2ea788068aedd1e84ddc7238ef40e7d479845d5a0' 
  AND token = 'WLh0egw4rNW2u951DA9yobvcf2kESfuoaNTeGI6UI0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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