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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8015da1d77443c9c314ab2e501860fca969a2eac594702faa9d38e8978f2d58f' 
  AND token = 'uqoWuXjQNUz9/5zmjfqIGoOEB1+S6zqzIq5Md5mIdFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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