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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac654cf6bc3fbd1bb34e9a8569b6b61612432cffe0484ef378e02f1fe8cc30b' 
  AND token = 'HehzgH6kCmN3TD7FbmhiFtVT1cYlUO7s4dE1g4rKXJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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