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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbbf279f0936577a81db2d4da5c2048de5f5818f3ba04d3a97ac84fb0f8dc5ca' 
  AND token = 'xa4bc+50ods7HbOWzB8NkUji9kN081lvpBxqRKmeBsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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