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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd10f387e6a406eb6dafddb7ad2b2d1f4664ddbba0349c84053b273389179a43' 
  AND token = '8INbVz/QSHR2YlJbayybK8Vc4rT3YJOpSe2EyPGq7J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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