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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3063a78e9af69a45dc19a59b40666ff02ae6f1a2d07da5c2e88c74c7a3e38ab8' 
  AND token = 'ELfckCEx25CtN34F1mLR41M62LRnR1UuuqULGq5/VGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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