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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c922da9479687a78914212b86769451ca8a6224bcefe1cfb6b8fdcdf92a07caf' 
  AND token = 'Gkk5l8dsDH3BuqIYKGGVftAAyPyFVIrat6xdTCYC+JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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