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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb0673a1023f4c4fe00f1fa9e7a0a3c0a982cd5c10b1b369337caa4579704bab' 
  AND token = 'G/17NbyfxvXuaAsaDPZUXOwD6OD0JyVtt2a9fBffLno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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