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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022968205831fed8eec2b1efeda371f28701bd7d988eb48f8431b0dda196dd1e' 
  AND token = 'D0kcEee3qysYly6xpI47dK87K7HxOUR+YRPacKP8Df0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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