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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7585af46bbcb03e67f1484582d38003cf9c1039b936c3869d5a530c27344a234' 
  AND token = '1ZMz4cx1/lr9+xZeH3MONDuqNZR9R1MH48EGVoDuxOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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