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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0c3311ee09f9dc6f89ea6d4694e7ed7576bc752bd9c4ee15d96fc0137c662b' 
  AND token = 'tduUq37/J9Lm15mZXHIBkRJHP8JpetiCGRFag07VqnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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