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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635995d0bd10855885a8e624d2bee5ed953115affb633e4b5389f87e8a1ec8d5' 
  AND token = 'dwWTsrKyWVM2b5G5gtwyTwlKh7FV0u4prvUIjkFeatw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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