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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1287ae8474930a982661a2c2e3e8933960832bf783c7cc877bc68e99a931bcb9' 
  AND token = '86hTT3wscZ/vCXgFtgaEqTlB9Ju4Jjxjy5Ll5tYKpW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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