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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3121a9c81648d31a224a60023b6e726fe9a3fb34c74ac48be23a163a348265c3' 
  AND token = 'm65L/EfhxrHq15Zwox5YzF306i6jiag6ZB3Bg5pwlto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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