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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf3c87313e4ce5f3a2423f040372e7a4cf0b4effcce6a208a2392b4310187f1' 
  AND token = 'B2hHCQqSHxZeqb7H+VBv75WxQRBsuTznpMKuU+rcTFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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