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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d176b311908c4b7e7a251c8d2a97261ac659182a0e838fb6120e3c308658603' 
  AND token = 'WdJwK3VbqT57S6NEWzRvdXFmMI89RTXmEj/8ZVamzVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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